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In computing, command substitution is a facility that allows a command to be run and its output to be pasted back on the command line as arguments to another command. . Command substitution first appeared in the Bourne shell, [1] introduced with Version 7 Unix in 1979, and has remained a characteristic of all later Uni
PowerShell data sections can contain constants and expressions using a restricted subset of operators and commands. [79] PowerShell data sections are used when e.g. localized strings needs to be read from an external source while protecting against unwanted side effects.
PowerShell is a task automation and configuration management program from Microsoft, consisting of a command-line shell and the associated scripting language.Initially a Windows component only, known as Windows PowerShell, it was made open-source and cross-platform on August 18, 2016, with the introduction of PowerShell Core. [5]
The > in the third example is a redirection operator, telling the command-line interpreter to send the output of the command not to its own standard output (the screen) but to the named file. This will overwrite the file. Using >> will redirect the output and append it to the file.
An introduction on Linux I/O Redirection "Linux I/O Redirection" Archived 10 June 2012 at the Wayback Machine with tee; GNU tee manual: duplicate standard input – Shell and Utilities Reference, The Single UNIX Specification, Version 4 from The Open Group; Plan 9 Programmer's Manual, Volume 1; Inferno General commands Manual
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In computing, redirection is a form of interprocess communication, and is a function common to most command-line interpreters, including the various Unix shells that can redirect standard streams to user-specified locations. The concept of redirection is quite old, dating back to the earliest operating systems (OS).
On Microsoft Windows, Remote Desktop Protocol can be used to provide GUI remote access, and since Windows Vista, PowerShell Remote can be used for text-based remote access via WMI, RPC, and WS-Management. [4] Most operating system shells fall into one of two categories – command-line and graphical.